Hi there, once you remove the screw if you get a fine headed screwdriver and prise it off from the centre hole where you took the screw from. Don't be shy the block underneath is very solid. It will come away and show you the two hex nuts. Remove the two hex nuts with an allen key to fit and then again prise with screwdriver in one of the holes until it pops off. I fix these machines every day and some can be very hard to get off. Don't be shy with giving it a bit of oomff to get it off. All the group head parts are very solid metals and are dificult to dammage. That should hopefully help you out and if you have any further problems please get in touch with David at coffeeservice@live.com and he can help you out.

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Had the same issue, my suggestion is:
1) find out what model it is
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http://cdn08.grohe.com/lib/1/tpi/766909.pdf

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1. Use the flywheel remover tool from tecumseh that threads onto the crankshaft threads. Tiy then strike that tool with a hammer to loosen the flywheel on the tapered shaft while applying a prying force under the flywheel.
2. Back the nut off on the crankshaft until the nut face is just flush with the bitter end of the crankshaft. The use a VERY large screwdriver or mini-crowbar under the flywheel to apply prying force. I find it is best if you use both a very large screw driver and a mini-crowbar while a 2nd person strikes the NUT flat / straight down on the end of the crank shaft. It will pop free and probably scare you when it comes loose. After it comes loose remove the nut and the flywheel.NOTE: Many of these engines have an OFFSET flywheel key if the engine has electronic ignition. If your not sure about the integrity of the flywheel key replace it. They are cheap.
3. If the flywheel has 2 threaded holes in it... you can make a flat puller plate with 2 holes that will cover the end of the crankshaft and the 2 holes you drill in the plate match up with the holes in the flywheel. You then use long bolts to screw into the 2 holes of the flywheel and the flat plate acts as a puller. You tension the bolts and strike the plate to get it to come free.

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